Abstract
The effect of added metals on the extraction of pertechnetate by 30% tri- n-butyl phosphate-odourless kerosene (TBP-OK) from HNO 3 solution was investigated. Eight metal ions (strontium, cerium(IV), magnesium, palladium, cobalt, zinc, calcium and scandium) were found to enhance the extractability of pertechnetate, in addition to the known uranium, thorium and zirconium. Zirconium is the most effective and has therefore been studied in most detail. This enhancement is considered to be due to the formation and extraction of a pertechnetate-zirconium complex, which is considerably more extractable than zirconium or pertechnetate separately. The basic solvent extraction properties of this complex were determined. The outline equation for the extraction of the complex is considered to be Zr 4+ + 3 NO 3 − + TcO 4 − + TBP → Zr( NO 3) 3( TcO 4) TBP
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